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B. S. AIKMAN.

PUMP.

APPLICATION FILED OCT. 5. 1911.

Patented Nov. 2, 1920.

' 2 SHIEETS HEET l.

B. S. AIKMAN.

PUMP.

APPLICATION nuzn 001.5, 1911.

1 ,357,671 Patented Nov. 2, 1920.

2 SHEETS SI-IEET 2.

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UNITED STATE SPAlENT OFFICE.

BURT-(3N l3. AIRMAN, .OF MILWAUKEE, fi/VISGONSIN, ASSIGNOE T8 NATIONALBRAKE 86 ELECTRIC COMPANY, OF MILVAUK'EE, VTISCO 'NSIN, A CORPGRATIGN OFWISCONSIN.

PUMP.

Specification of Letters Patent. 7 Patented N 2, 19,;{1

Application filed October '5, 1917. serial no. lessee.

an isolated plant for furnishing water to a residence or an. industrialestablishment from a nearby source, such as a well.

it is the purpose of my invention to provide an improved pump for use ina system w iicli supplies water fresh from the well, that is, withoutthe intervention of a stora e or reserve tank and which will be underi'aucet control by which I mean that the low of water is controlled byopening and closing the faucets which form the supply outlet of thesystem.

The pump operates so long as it is supplied, with compressed air and hasa tree outlet for the water. If the outlet is completely shut oil', aswhen all the faucets are closed, the pump ceases to operate. As soon asan outlet is provided, as by opening a faucet, the pump again operates.As the running of the pump is dependent upon the provision of an outletas by opening the faucets, this type of system is designated a faucetmmtrol system.

'1'. he object of the present invention is to provide a pump of thisclass which is ellicicnt, simple, rugged and inexpensive to manufactureor to operate. Many of the pumps of this general type new found on themarket are ine'ilicient in the use oi compressed air, or motive fluid.This is ,genorally the fault of poor design and construction andparticularly it is due to the. fact that '11 many of the prior artdevices a separate air motor ied independently with compressed air isemployed to operate the ralves.

I employ the air which works the valves in the hmly of the pump toperform work, thus a maximum etllciency of the air is secured.

Another disadvantageous feature of the prior art devices is the factthat they use the air noirexpansively. This is because the valves arepurely level controlled.

air is used expansively, that is, the air is permitted to work so longas it has suiiicient pressure to do so before it is exhausted. This issecured by providing pressure control in addition to the usual levelcontrol. A further advantage of the present invention is the ability todispense with a maintaining valve and employ a simple reduction valve. f

A further advantage is the ability to make up the device in small sizeof few parts and oil rugged construction. It is impossible for the valvemechanism to become so set that air can blow through the device withoutdoing work. Numerous other advantages will be apparent from thefollowing specilication.

One embodiment of my invention is illustrated in the accompanyingdrawings, in which-- Figure 1 is a more or less diagrammatic viewillustrating the system as a whole;

Fig. 2 is a vertical axial sectional view of y the pump; and V andlooking in the direction indicated bythef arrow.

As shown diagrammatically in Fig. 1, the pump is disposed in the well,the curbing oi which is shown at 5, below the level 6 of the water sothat the pump automatically fills at the proper time, as will bedescribed later. The pump structurehas leac ing therefrom three pipes,an air pressure pipe 7, an exhaust pipe 8, and a water discharge pipe 9.The water discharge pipe 9 is connected with the air spring 10 and withvarious branch pipes 11, 11, each of which is provided with a faucet 12.The air pressure pipe 7 isconnected through the reducing valve 13, andthe pipe 1i and 15, with a compressed air tank 16, in which air isstored under pressure as by means 01 a suitable compressor 17 driven bythe motor 18. It will be apparent to those skilled in the art that thecompressor may be operated by any other motor such as a engine, steamengine, or the like, and if desired, means may be provided forautomatically starting and stopping the motor when the pressure in thetank drops to a prescribed minimum ssj prescribed maximum, respec-'convenient manner.

The pump 4 is shown in detail in Figs. 2 and 3. The pump comprises acylindrical barrel 22, preferably in the form of a piece of seamlessbrass tubing. The upper end of the barrel is closed off by a headcasting 23 and the lower end of the barrel is closed off by the footcasting 24. The head casting 23 and the foot casting 24 are heldtogether upon the ends of the barrel 22 by means of the tie pipes 25 and26 which serve also as discharge pipes. At their upper ends these pipesare screwed into suitable openings provided in the head casting 23 andat their lower ends these pipes are screwed into suitable openings inthe upper )art of the valve cage 27. The valve cage 21 is connected tothe foot member 24 by means of the central bolt 28. The valve cage 27incloses the check valve 29 which controls aport 3O communicating withthe lower part of the pump cylinder 22 by way of the passageways 31. Thefoot member 24 is provided with inlet ports 32 which are controlled bythe check valve 33. A conical screen 34 covers the bottom of the footmember 24 and prevents the entry of foreign matter to the pump cylinder.Suitable packing. as shown at and 36, serves to make a tight ointbetween the ends of the barrel and the head and foot castings,respectively.

The air inlet pipe 7, air exhaust pipe 8, and water discharge pipe 9 arethreaded, respectively, into the air inlet 37, exhaust air outlet 38 andwater discharge out-let 39 of the head casting 23 of the pump. The wateroutlet 39 is in communication with the pipes 25 and 26 by means of thepassageway 40.

The air inlet 37 communicates with the interior of the pump cylinder 22by means of the passageways 41 and 42, diaphragm chamber or cylinder 43,and passageways 44, 45, 46 and 47. The passageway 41-42 is of smallersize than the passageway 44454647 so that there is normally a reductionof pressure due to the restricted flow, in the cylinder 43. Thepassageway 47 is formed through a removable nipple which forms a valveseat. This valve port 47 is controlled by a valve member 48, mounted onthe arm 49 of a bell-crank lever 50. The bell-crank lever 50 rocks upona bolt 51, bearing in the arms 52 which project from the head casting23. The arm 53 of the bell-crank lever has pivotally connected thereto awater weight 54 by means of the link 55. The opposite arm 56 of thebell-crank lever 50 is provided with projecting pins 57, 57 which areconnected at their ends to the springs 58, 58, these springs beingconnected at their upper ones to the head casting 23. The water weight54 comprises a hollow cylindrical body consisting of a shell of metal59, preferably a tube oi brass or bronze, or the like, and having itslower end closed. by a head 60, this head be ing provided with a guidingpin 61., which is guided in a suitable bracket 62 projecting from thevalve cage 27. The head 60 has projecting therefrom an arm 63 to whichis secured a spring 64, this spring being connected at its upper end tothe bracket 65, which is clamped about the pipes 25 and 26. The spring64 serves to counterbalance a part of the weight of the float or waterweight 54. I have found that a float may be employed where for certainreasons it is desirable. In that case the springs 58 are eliminated.

Referring now to the mechanism for con trolling the exhaust, it will beseen that a portion of the diaphragm chamber or cylinder 43 is formed inthe head casting 23 and the other portion is formed by provid ing asuitable recessed member 67, which is secured to the head casting bymeans of suitable screws, the diaphragm 68 being clamped and held inplace between the member 67 and the head casting. The h ad casting 23has provided, in a suitable pocket, a sleeve member 69, through which astem 70 slides freely. The stem 70 is reduced in diameter at each end,one end being threaded and clamped to the diaphragm 68 by means of thelock nut 71 and the other end b3 firmly secured to the valve 72controllin port 7 8 communicating with the on. Just outlet 38. The valve72 seats with the pressure in the pumping chamber and hence always tendsto remain tight while under pressure. A spring 74 is placed between thehead casting and the diaphragm ($8 to hold normally the valve 72 tightagainst its s thus closing off the exhaust port T e valve 72 closes offthe port by means or a double seat so that no packing for the sleeve 69is necessary.

lVhen the pump is submerged in the v e-' and the exhaust valve is openthe water pass through the openings in the screen 34 up through the port3 past the check valve 33, and substantially fill the cylinder 22. Asthe level of the water in the pump tends to rise, the water weight 54also tends to rise due to the springs (34 and the support aitorded bythe water until the up 'ard thrust is suilicient to overcome the pull ofthe springs 5858. The bell-cranlz lever 50 then turns quickly about itspivot and causes the passageway 47 to be uncovered with a sharp snap.When the water is driven out of the barrel obviously the water weightwill move to its lowest position, thereby causing the bell-crank lever50 to turn about its pivot 51, in a clockwise di rection in Fig. 3, thuscausing the valve 4:8 to close o'tf the passageway 47. The springs 58,58 cause the valve 48 to open and close positively and quickly with asnap action. The maximum resistance offered by these springs occurs intheir outermost position. Hence as soon as the water weight 54:evercomes the initial tension in either direction the valve opens andcloses at once I find it desirable in the operation of the pump to keepthe port 4:? closed by the valve 48 until the pump is substantially fullof water and to accomplish this result I provide the flow controlledbrake 75. This brake consists of a bell-crank lever pivotally secured tothe upper part of the valve cage 27, one arm of which bears against theguiding rod 61 secured to the water weight 5d and the other arm of whichis attached to a circular plate 76. The plate 76 is disposedhorizontally in the pump cylinder and covers considerable area. When thewater in the pump rises the plate is pushed upwardly by the incomingcurrent of Water, causing one arm of the bell-crank lever 7 5 to pressagainst the rod 61 and hold the water weight down. lVhen the pump issubstantially full of water the flow into the pump abates and the brakeis released, which permits the water weight to rise and open the valve48.

A passageway 7 7 is provided from the interior of the pump to thechamber on the righthand side of the diaphragm 68 so that when air isadmitted to the interior of the pump the pressures on both sides of thediaphragm 68 tend to equalize. The passageway 4:1 is restricted in area,while the passageways a l, 45, d6 and 4L7 are of considerably largerarea. This permits the air to pass freely out of the diaphragm chamber43 to the interior of the pump and around to the right hand side of thediaphragm 68, thus preventing the exhaust valve 69 from opening untilthe proper time, as no pressure builds up in the chamber on the frontside of the diaphragm.

Assuming the pum to be connected to a system as shown in ig. 1 with theparts in the position shown in Figs. 2 and 8, the operation of the pumpand the system is as follows:

When a faucet is opened, water will flow out of the air spring 10, thuslowering the pressure of the water therein and permitting the pump tooperate. The air passes through therestricted passageways l-l and 42into the diaphragm chamber 43 and through the passageways A, 45, 46 and47 to the interior of the pump cylinder. The

pump being full'of water, the water is forced down in the pump cylinderthrough the passageways 31, 31, port 30, past the check valve 29, upthrough the pipes 25 and 26, through the passageway 40, pipe 9, andtothe air spring 10 and consumption mains 11, 1.1, from which it may bedrawn through a faucet for use. As the water passes out of the pumpcylinder, the water Weight 54 tends to drop. lVhen the downward pullbecomes great enough to overcome the springs 58, 58 the water weightcauses the valve 48 to close, thus cutting off the supply of air totheinterior of the pump. The pressure then builds up on the left handside, i. 6., the front of the diaphragm 68 until it is sufiicientlyhigher thanthe pressure of the air in the body of the pum r which latterpressure is exerted on the back of the diaphragm 6.8 to overcome thetension of the spring 74:, thus forcing the valve 72 away from its seatagainst the pressure of the'motive fluid tending to hold it to its seatand permitting the air to exhaust. lVhen the pump cylinder has beenexhausted the water will again rise in the pump until it issubstantially full of water. Then the water weight 54 willbe releasedand rises opening the valve 4:8 and air again is admitted to the pump.It will be seen that water may pass either to the consumption mains 11,11 or into the'air spring 10. The

air cushion in the chamber 10 fills in the gap between the strokes ofthe pump sothat the flow'of water at the faucets l2 12. is substantiallyconstant and no cessation of pressure is noticeable. lVhen all ofthe'body of the pump before the exhaust valve 72 can be opened as theexhaust valve 72 is held to seat by the pressure of the motive fluidwithin the pumping chamber; This pressure can build up only after theair admission valve l8 is closed. p

The efiiciency of the pump is marked because of the fact that expansionof the air is permitted after the control valve 48 is closed. This issecured by requiring a difference of pressure on the two sides of thediaphragm 68 before the exhaust valve can be openeds No maintainingvalve is necessary because of the difference in pressure required onopposite sides of the diaphragm 68. The reducing valve keeps excessivepressure from forming when the faucets are closed" and the restrictedorifice all prevents overworking of the pump when the faucets are allopened wide.

If one of the faucets is just open enough to permit of a dripping at thesame the valve action cannot become centered and cause a blowoverbecause of the requirement to build up pressure in the front chamber 43after the valve 48 is closed and a drop in pressure outside before theexhaust valve can open.

I claim:

1. In combination, a main pump barrel having water inlet and outletvalves, an exhaust valve, a diaphragm connected to the exhaust valve,one side of the diaphragm being subject to the pressure in the interiorof the barrel, a chamber on the other side of the diaphragm having arestricted compressed air inlet port and a relatively free outlet portfrom the chamber into the pump barrel, and a valve governed by the levelof the Water for controlling the outlet port.

2. In combination, a main pump barrel having Water inlet and outletvalves, an exhaust valve, a diaphragm connected to the exhaust valve, achamber on one side communicating with the interior of the barrel, achamber on the other side having a restricted compressed air inlet portand a relatively free outlet port from the chamber into the pump barrel,a valve, and a level controlled device for governing the valve.

3. In combination, a pump barrel, an exhaust valve, a movable pressurecontrolled member connected to said valve, a chamber communicating withthe interior of the barrel on one side of the member, a chambercommunicating with a source of motive fluid on the other side of themember and a level controlled *alve governing said member.

4. In combination, a pump barrel, an exhaust valve for the barrel, apressure controlled device subject to the pressure within the barrel anda level controlled device subject to the level of the liquid in thebarrel, said exhaust valve being jointly controlled by said devices.

5. In combination, a pump barrel, an exhaust valve, a pressure elementsubject to the pressure in the barrel for controlling the exhaust valve,and an inlet valve governing said pressure element.

6. In combination, a pump barrel, an exhaust valve, a pressure elementsubject to the pressure in the barrel for controlling the exhaust valve,an inlet valve governing said pressure element, and a level controlleddevice governing said inlet valve.

7. In combination, a pump barrel, an exhaust valve, and a pressureelement subject to the difference in pressure between the incomingmotive fluid and the pressure within the barrel for operating saidexhaust valve.

8. In. combination, a pump barrel, an exhaust valve, a pressure elementsubject to the difference in pressure between the incoming motive fluidand the pressure within the barrel for operating said exhaust valve, andan inlet valve controlling the application of the pressure of the motivefluid to said element.

9. In combination, a pump barrel, an exhaust valve, a pressure elementsubject to the difference in pressure between the incoming motive fluid.and the pressure within the barrel for operating said exhaust valve, aninlet valve controlling the application of the pressure of the motivefluid to said element, and a level controlled device governing saidvalve.

lO. In combination, a closed pump cylind admii,,.ion and exhaust portsfor said cylinder, water inlets and discharge passagew ys for saidcylinder, valves controlling said admission and exhaust ports, means controlled by the level oi? the water in said c v1 ii er for operating thevalve to said admission port, and means controlling the valve to exhaustport operative only when the valve to saic admission port is closed.

11. In combination, a closed pump cylinder, adniiission and exhaustports for said cylinder, water inlets and discharge passage ways forsaid cylinder, valves controlling said admission and exhaust ports,water lit within said cylinder for operating the valve to said admissionport, and means controlling the valve to said exhaust port, eperativeonly when the valve to said admission port is closed.

In combination, a closed pump cylinadmission and exhaust ports tor saidider, water inlet and discharge passages for said cylinder, valvescontrolling aemission and exhaust ports, a level said controlled devicewithin said cylinder for operating the *alve to said admission port,means controlling the valve to said exhaust port, and means to hold thevalve controlling said adinisi. :1 port closed until the cylii'ider issubstantially full oi water.

In combination, a closed pump cylinder, admission and exhaust ports forsaid cylinder, water inlet and discharge passageways for said cylinder,valves controlling said admission and exhaust ports, a level controlleddevice within said cylinder for 01 ating the valve to said admissionport, nicans controlling the valve to said exhaust port, and a brakeassociated with said level controlled device to hold the same down untilthe pump is substantially full of water.

let. In combination, a closed pinup cylinder, admission and exhaustports for said cylinder, water inlet and discharge passageways for saidcylinder, valves controlling said admission and exhaust ports, meanscontrolling the valve to said exhaust port, means controlling the valveto said admis sion port, a level controlled device in said cylinder, andmeans controlled by said level controlled device for imparting a snapaction to said admission valve controlling means.

15. l n a pump, a cylinder, a cylinder head member having a chamber fora diaphragm, an air admission port communicating with said diaphragmchamber, a passageway leading from said chamber to the interior of saidcylinder, a valve controlling said passageway, an exhaust portcommimicating with the interior of said cylinder, a valve controllingsaid exhaust port and operated by said diaphragm, and means controlledby the level oi the water in the cylinder for operating the valvecontrolling said admission passageway.

16. In a pump, a cylinder, a cylinder head member having a chamber for adiaphragm, an admission port, a restricted passageway leading from saidport to said dipahragm chamber, a relatively free passageway lead ingfrom said chamber to the interior ofsaid pump cylinder, a valvecontrolling said rela tively tree passageway, an exhaust port com--municating with the interior of said cylinder, a valve controlling saidexhaust port and operated by said diaphragm, and means controlled by thelevel of the water in the cylinder for operating the valve controllingsaid relatively free passageway.

17. in a pump, a cylinder, a cylinder head member having a chamber for adiaphragm, an air admission port communicating with one side of saiddiaphragm chamber, a passageway leading from said chamber to theinterior of said cylinder, a valve controlling said passageway, apassageway leading from the interior of said cylinder to the other sideof said diaphragm chamber, an exhaust port communicating with theinterior of said cylinder, a valve controlling said exhaust port andoperated by said diaphragm, and means controlled by the level ofthewater in the cylinder for operating said admission passageway.

18. In a pump, a pumping cylinder having inlet; and discharge valves forliquid, admission and exhaust valves for motive fluid, a motor foroperating one of the valves for motive fluid, a level controlled devicegoverning said motor, and means for dis-' charging the exhaust of themotor into the cylinder during the admission period of the cylinder.

- 19. in a pump, a cylinder having inlet and discharge valves forliquid, admission and exhaust valves for motive fluid, a motor foroperating the exhaust valve, a level controlled device governing saidmotor and means :lor discharging the exhaust of the the valvecontrollingmotor into the pump cylinder and opening the admission valveof thecylinder, said means being responsive to high level conditions inthe cylinder.

20. In combination, a pump cylinder having inlet and discharge valvesfor liquid, admissionand exhaust valves for motive fluid, a motor foroperating the exhaust valve and level controlled means responsive to lowlevel conditions in the cylinder governing the effective application ofpressure to the motor to open the exhaust valve, said motor having aconnection with the pump cylinder-for discharging the exhaust from themotor cylinder into the pump cylinder.

21. In a pump, a cylinder having inlet and discharge, valves for liquid,admission and exhaust valves for motive fluid, said exhaust valve havingayielding face and being adapted to be held to its seat by the pressureof motive fluid within the cylinder, a motor having a flexible diaphragmfor operating the exhaust valve in one direction, spring means formaking the return stroke of the motor, and level controlled meansresponsive to low level conditions in the cylinder governing theapplication of pressure to the motor to open the exhaust valve.

22. In a pump, a pumping cylinder, inlet and discharge means for liquid,admission and exhaust passageways for motive fluid, an exhaust valve, apressure operated motor, said motor comprising a pressure chamber and amovable piston, and level controlled means governing the accumulation ofpressure in said pressure chamber, said motor controlling the operationof said exhaust valve, said motor discharging its exhaust into thepumping cylinder.

23. In a pump, a pumping cylinder, inlet and discharge means for liquid,admission and exhaust passageways for motive fluid, an exhaust valve, apressure operated motor adapted to communicate with the admissionpassageway, said motor comprising a pressure chamber and a movabl'e''piston and means controlled by the low level of liquid in the pumpingcylinder for controlling the application of pressure to the. piston,said motor controlling the operation of the exhaust valve, the exhaustof said motor being discharged into the pumping cylinder when thecylinder is filled with water.

24L. In combination a pump barrel, comprising a cylinder, an admissionpassage way, an admission port, an exhaust port, a valve for the exhaustport, means tendingto close the exhaust port, a valve for the admissionport, a level controlled device governing said admission valve, and amotor having a motor chamber connecting with the admission passagewayand the admission port, said motor controlling said exhaust port.

25; In combination, a pumping chamber,

inlet and discharge valves for liquid, an admission passageway formotive fluid, an admission port for achnitting motive fluid to thepumping chamber from the passageway, a motor cylinder communicating Withthe admission passageway, a piston for the cylinder, an exhaust valvecontrolled by the piston, and a float responsive to the low level ofliquid for controlling the effective appli cation of pressure to thepiston, said motor cylinder having a restricted opening for theadmission of motive fluid.

26. In combination, a source of motive fluid, a pump barrel subject tohigh level and to loW level conditions therein, an ex haust port, anexhaust valve therefor, an inlet port, an inlet valve therefor, a floatcontrolled by one level condition for operating one of said valves foreach pump stroke, and a pressure motor having a cylinder communicatingwith the source of motive fluid through a restricted connection andhaving a piston operated by the pressure of the motive fluid Within thecylinder upon the other extreme level condition for controlling theother of said valves for each pump stroke.

27. In combination, a source of motive fluid, a pump cylinder having airinlet and exhaust valves, a motor having a diaphragm, said motor havinga restricted communication with the source of motive fluid, one of saidvalves being operated by said diaphragm for each stroke of the motor, aspring for the diaphragm for holding the diaphragm in one extremeposition, a float controlling the other valve, said float and othervalve controlling the application of pressure to said diaphragm toovercome the pressure of the spring to shift the first valve for eachstroke of the pump.

28. In combination, a pump cylinder having Water inlet and dischargeports, admis sion and exhaust ports, admission and exhaust valvestherefor, level controlled means for controlling said valves for eachstroke of the pump, and flow controlled means subject to the flow ofWater into the cylinder for controlling the movement of said levelcontrolled means.

29. In combination, a pump cylinder having a Water inlet port, a Waterdischarge port, an exhaust air port and an air inlet port, a passagewayleading from the air inlet to the interior of the pump, said passageWaycomprising a pressure cylinder, an inlet valve controlling saidpassageway, a float valve controlled by high level for causing thepressure to build up in said pressure cylinder, a piston for thepressure cylinder, and a valve controlled by the movement of saidpiston, said valve controlling one of said air ports.

30. In a pump, a cylinder having inlet and discharge passages forliquid, admission and exhaust passages for motive fluid, a

motor for ope 'ating the exhaust valve, and a loW level controlled valvegoverning said motor, said motor being adapted to dis charge the exhausttherefrom back into the cylinder.

31. In combination, a pump cylinder, a motor cylinder, a motor pistonfor said lat ter cylinder, an exhaust valve controlled by said piston, aspring for holding the piston at one end of its stroke and for holdingthe exhaust valve closed, and a float controlled valve controlled by thelow level in the cylinder and a motive fluid port controlled by thefloat valve for controlling the pressure Within the cylinder to open theexhaust valve.

32. In combination, a cylinder, a head member for closing the top of thecylinder, a foot member for closing the bottom of the cylinder, a valvebox in the cylinder, said box having a valved port for permitting theWater to be driven from the pump cyl inder into the box, a Waterdischarge passageway in the head member, a pipe connecting thepassageway in the head member With the box, and a threaded pinconnecting the valve box and foot member, said pipe, box and pin servingas a mechanical con nection between the head member and the foot member.

33. In combination, a cylinder, a head for the cylinder, a foot memberfor the cylinder, connecting means for the head and foot member, saidconnecting means lying Within the cylinder, said foot member comprisinga central boss having an annular opening, comprising a- Water inletport, an annular valve for said port and a central guide for said valve,said central guide bcing connected to said foot member.

34;. In combination, a cylinder, a head member, a foot member, said footmember comprising a central boss, means comprising a rod for connectingthe head member and the foot member, said rod passing through saidcentral boss, said foot member having an annular inlet port about saidcentral boss, and an annular valve for controlling said port.

35. In combination, a pump chamber com prising a cylinder having a headmember and a foot member, said head member having a valve and motormember mounted thereon and disposed Within the cylinder, said memberhaving air inlet and exhaust valves, and a valve operating motor havinga diaphragm, one of said valves being operated by said diaphragm foreach stroke of the pump, a spring for the diaphragm for holding thediaphragm in one extreme position, the other valve being levelcontrolled, said other valve controlling the ap plication of pressure tosaid diaphragm to overcome the pressure of the spring to shift the firstvalve for each stroke of the pump.

36. in combination, a pumping chamber comprising a cylinder, a headmember and a foot member, a valve and motor structure mounted on thelower side of the head and disposed within the cylinder, a headstructure compriz-sing an inlet and an exhaust valve and a motor foroperating one of said valves and a float for operating the other of saidlves, said other valve governing the application of pressure to saidmotor for operating said one valve.

37. in combination, a pumping chamber, a main exhaust valve, a pressuremotor, a restricted passageway providing constant comn'u'inicationbetween the source of motive lluid and the pressure motor, an exhaustport for the pressure motor opening into the pumi'iing chamber, saidexhaust port being of larg r capacity than the restricted passageway,and a level controlled valve governing said exhaust port.

38. in combination, a pumping chamber, a main exhaust valve, a pressuremotor, a restricted passageway providing constant comnimiication betweenthe source of motive fluid and the pressure motor, an exhaust port forthe pressure motor opening into the pum iiing chamber, said exhaust portbeing of larger capacity than the restricted passageway, means to seatthe main exhaust valve with the pressure of the motive fluid in thepumping chamber, and a level controlled valve governing said exhaustport.

39. ln. combination, a pump cylinder haviug air inlet and exhaustvalves, motor having a diaphragm, one of: said valves being operated bysaid diaphragm for each stroke oi the motor, a spring for the diaphragmfor holding the diaphragm in one extreme position, said diaphragm beingexposed on the side of the spring at all time to the pressure prevailingwithin the cylinder, :2 'l'loat controlling the other valve, the floatand other valve COIl't'lOlllil the application oi" pressure to saiddiaphragm to overcome the pressure 01 the spring, to shift the firstvalve for each stroke of the pump.

40. in combination, a source of motive fluid a pumping chamber, anexhaust port for the pumping chamber, an exhaust valve for said port,said exhaust valve being held. to by the pressure within the pumpingchamber, a pressure motor having a movable member subjected on one sideto the pressure o motive fluid with in the pump chainher and having achamber on the other side prm'idcd with restricted but constai'itly opencomnuinication to the source of motive fluid and a W controlled valvegoverning the exhaust of pressure "from said latter chamber.

1:1,. in a pump, a cvlinder havi member, .id uid check a head .alves torthe cylinder,

an air admission valve, an air exhaust valve, ports for said valvesformed in said head, said exhaust valve having a yielding face adaptedto be held against its seat by internal pressure, said admission valvebeing of relatively smaller size than the exhaust valve and beingadapted to be held to seat against the pressure of the motive fluid, apressure motor comprising ,a flexible diaphragm for moving the exhaustvalve away from seat against the internal pressure of the cylinder whenthe water has been driven from the pump cylinder and level responsivemeans adapted at low level to cause said admission valve to close.

42. In a pump, a cylinder having a head me aber, liquid check valves forthe cylinder, separate air admission and air exhaust valves for thecylinder, ports for said valves formed in said head, said exhaust valvehaving a yielding face adapted to be held against its seat by internalpressure, said admission. valve being of relatively smaller size thanthe exhaust valve, a pressure motor mounted on said. head and comprisinga flexible diaphragm for moving the exhaust valve away from seat againstthe internal pressure of the cylinder when the water has been drivenfrom the pump cylinder and level. responsive means controlling saidmotor at low level. to open the exhaust valve, said exhaust valve beingadapted to be held open and said admission valve adapted to be heldclosed until water has substantially t-ii cd the pump chamber.

in a pump, a cylinder, liquid check valves for the cylinder, a pressuremotor having; a chamber and a movable member adaped to be operated bymotive fluid, a restricted passageway connecting said chamhe with asource of motive fluid, a main exhaust valve adapted to seat withinternal pressure and adapted to be moved off seat against said internalpressure by the movable motor member, a control valve for exhaust of themotor and means responsive to level in the pumping chamber for operating said control valve.

44. In pump, a cylinder having liquid check valves, a pressure motorhaving a chamber and movable member adapted to be operated by motivefluid, a constantly open restricted passageway connecting said chamberwith a source of motive fluid, a main exhaust valve adapted to seat withinternal pressure and adapted to be moved oil seat against said internalpressure by the movable motor member, an exhaust valve for the motor anda level responsive device con-- trolling said motor exhaust valve.

In witness whereo't l hereunto subscribe my name this 1st dav of OctoberA. D, 1917.

BURTON S. ,LIKMAN.

